Playback apparatus, playback method, and recording medium

ABSTRACT

Audio data are played back by a personal computer, a relationship with a playback process is recognized easily. Displays showing the contents of play lists are arranged and displayed so that the contents become continuous in sequence in a playback sequence from content that is currently being played back from a display of an operation element that causes an image of a playback process to appear or from a display showing the content which is currently being played back. When the playback of one piece of content of one play list from among a plurality of play lists is terminated and one piece of content of an other play list is played back, at least the content that is currently being played back and content to be subsequently played back are displayed so that the contents can be distinguished.

BACKGROUND OF THE INVENTION

1. Field of the Invention

The present invention relates to a playback apparatus, a playbackmethod, and a recording medium, and can be applied to a case in which,for example, audio data is played back by a personal computer.

2. Description of the Related Art

Conventionally, in personal computers, for example, entry of a play listby a user is received, and audio data, which is content recorded on ahard disk unit, can be played back in accordance with the play list.

Furthermore, in such a playback of audio data, parameters used in thesetting of an equalizer, a sound field, etc., can be switched by anoperation of a user. As a result, audio data can be played back in anatmosphere desired by the user. On the display screen, operationelements for switching these effects is displayed so that the backgroundcan be changed variously in accordance with the preference of the user.

For such a playback in accordance with a play list, in addition to theplayback of audio data based on the sequence recorded in the play list,there is what is commonly called a “random playback”. This makes itpossible to perform a playback in a different sequence of musical pieceseach time a playback is performed so that the user do not become boredeven when a playback is performed in accordance with the same play list.

However, even in such a random playback, there is a case in which theuser becomes bored after all. Under these circumstances, if, in additionto such a playback method, these contents can be played back by anothermethod, the ease of operation of this type of playback apparatus can beimproved even more.

SUMMARY OF THE INVENTION

The present invention has been made in consideration of the abovepoints. A first object of the present invention is to propose a playbackapparatus, a playback method, which are capable of playing back contentsby a method different from a conventional method, and a recording mediumon which a playback procedure is recorded.

By cutting out each content and playing it back in sequence on the basisof a predetermined cut-out pattern in which at least a playback time isset, the contents can be played back by a method different from aconventional method.

If a setting operation such as that described above can be simplified,the ease of operation of this type of playback apparatus can be improvedeven more.

A second object of the present invention is to propose a playbackapparatus, a playback method, which are capable of simplifying thesetting of a display screen when audio data is played back by a personalcomputer, and a recording medium on which a playback processingprocedure is recorded.

By switching the conditions of the operation of a processing systemwhich processes contents and by stepping the design of a display screenin response to the switching, the setting of the display screen can besimplified.

In addition, for the playback of audio data in accordance with a playlist such as that described above, a play list is displayed duringplayback, and this display of a play list makes it possible to confirmthe sequence of the playback and the piece of music which is currentlybeing played back. However, if the relationship with the playbackprocess, such as what piece of music is currently being played back, andwhat piece of music is to be played back next, can be recognized evenmore easily, the ease of operation of this type of application programcan be improved even more.

A third object of the present invention is to propose a playbackapparatus, a playback method, which are capable of recognizing therelationship with the playback process even more easily than aconventional way, and a recording medium therefor.

The displays showing the contents of play lists are arranged anddisplayed from a display of an operation element which causes an imageof a playback process to appear or from a display showing the contentwhich is currently being played back so that the contents becomecontinuous in sequence in a playback sequence, allowing the relationshipwith the playback process to be recognized more easily than aconventional way. Furthermore, when the playback of one piece of contentof one play list from among a plurality of play lists is terminated, ina case where one piece of content of another play list is played back,at least the content which is currently being played back and thecontent which is to be played back next are displayed in such a mannerthat the contents can be mutually distinguished from the other content.Thus, even when a plurality of play lists is selected in content units,the relationship with the playback process can be recognized even moreeasily than a conventional way.

In order to achieve the above-mentioned objects, according to one aspectof the present invention, there is provided a playback apparatus or aplayback method, in which portions to be partially played back are setin each content of a group of contents on the basis of a predeterminedcutout pattern in which at least a playback time is set, contents areselected in sequence from the group of contents, and the portions to bepartially played back which are set in the selected content are playedback in sequence.

According to another aspect of the present invention, there is provideda recording medium on which a processing procedure is recorded, theprocessing procedure comprising the steps of setting portions to bepartially played back in each content of a group of contents based on apredetermined cut-out pattern in which at least a playback time is set,selecting a piece of content in sequence from the group of contents, andsequentially playing back these portions to be partially played backwhich are set in the selected content.

According to the construction of the playback apparatus or the playbackmethod of the present invention, portions to be partially played backare set in each content of a group of contents based on a predeterminedcut-out pattern in which at least a playback time is set, and theseportions to be partially played back are played back in sequence,thereby making it possible to play back the contents like a digest in atelevision, a radio, etc.

As a result, according to the construction of the recording medium ofthe present invention, it is possible to obtain a recording medium onwhich a playback procedure capable of playing back contents by a methoddifferent from a conventional method is recorded.

According to another aspect of the present invention, there is provideda playback apparatus or a playback method, wherein the operatingconditions of a processing system which processes at least contents areswitched in response to an operation of a predetermined operationelement, and the design of the display screen is switched in response tothe switching.

According to another aspect of the present invention, there is provideda recording medium on which a playback procedure is recorded, theplayback procedure comprising the steps of: switching the operatingconditions of a processing system which processes at least contents inresponse to an operation of a predetermined operation element; andswitching the design of a display screen in response to the switching.

According to the construction of the playback apparatus or the playbackmethod of the present invention, the conditions of the operation of aprocessing system which processes at least contents is switched inresponse to an operation of a predetermined operation element, and thedesign of a display screen is switched in response to the switching,thereby making it possible to collectively switch the processingconditions and the design of the display screen. This makes it possibleto simplify the setting of the display screen.

As a result, according to the construction of the recording medium ofthe present invention, it is possible to provide a recording medium onwhich a playback procedure capable of simplifying the setting of adisplay screen is recorded.

According to another aspect of the present invention, there is provideda playback apparatus or a playback method, wherein displays showing thecontents of a play list are arranged so that the contents becomecontinuous in sequence in a playback sequence from the content which iscurrently being played back at least from a display of an operationelement for instructing the starting or stopping of playback, and theplay list is displayed.

According to another aspect of the present invention, there is provideda playback apparatus or a playback method, wherein displays showing thecontents of a play list are arranged so that the contents becomecontinuous in sequence in a playback sequence with respect to a displayshowing the content which is currently being played back, and the playlist is displayed.

According to another aspect of the present invention, there is provideda playback apparatus or a playback method, wherein a plurality of playlists are displayed, when the playback of one piece of content of oneplay list from among a plurality of play lists is terminated, one pieceof content of another play list is played back, and at least the contentwhich is currently being played back and the content to be played backnext are displayed in such a way that the contents can be mutuallydistinguished from the other content.

According to another aspect of the present invention, there is provideda recording medium on which a playback processing procedure is recorded,the playback processing procedure comprising the steps of: arranging thedisplays showing the contents of a play list so that the contents becomecontinuous in sequence in a playback sequence from the content which iscurrently being played back at least from a display of an operationelement for instructing the starting or stopping of playback; anddisplaying the play list.

According to another aspect of the present invention, there is provideda recording medium on which a playback processing procedure is recorded,the playback processing procedure comprising the steps of: forming adisplay showing the content which is currently being played back in apredetermined area of a display section; arranging the displays showingthe contents of the play list so that the contents become continuous insequence in a playback sequence with respect to the display showing thecontent which is currently being played back; and displaying the playlist.

According to another aspect of the present invention, there is provideda recording medium on which a playback processing procedure is recorded,the playback processing procedure comprising the steps of: displaying aplurality of play lists; when the playback of one piece of content ofone play list from among the plurality of play lists is terminated,playing back one piece of content of another play list; and displayingat least the content which is currently being played back and thecontent to be played back next in such a way that the contents can bemutually distinguished from the other content.

According to the construction of the playback apparatus or the playbackmethod of the present invention, the displays showing the contents ofplay list are arranged so that the contents become continuous insequence in a playback sequence from the content which is currentlybeing played back at least from a display of an operation element forstarting or stopping of playback, and the play list is displayed. As aresult, it is possible to cause an image of a playback process to appearby the display of the operation element, and to cause an image of arelationship between the playback process and the content to appear bythe arrangement of the displays showing the continuous contents. Thus,it is possible to recognize the relationship with the playback processeven more easily than a conventional way.

According to the construction of the playback apparatus or the playbackmethod of the present invention, the displays showing the contents ofthe play list are arranged so that the contents become continuous insequence in a playback sequence with respect to a display showing thecontent which is currently being played back, and the play list isdisplayed. As a result, it is possible to cause an image of a playbackprocess to appear by the display showing the content which is currentlybeing played back, and to cause an image of a relationship between theplayback process and the content to appear by the arrangement of thedisplays showing the continuous contents. Thus, it is possible torecognize the relationship with the playback process even more easilythan a conventional way.

According to the construction of the playback apparatus or the playbackmethod of the present invention, a plurality of play lists is displayed,when the playback of one piece of content of one play list from among aplurality of play lists is terminated, one piece of content of anotherplay list is played back, and at least the content which is currentlybeing played back and the content to be played back next are displayedso that the contents can be mutually distinguished from the othercontent. Thus, even when a plurality of play lists is selected incontent units and is played back, the relationship with the playbackprocess can be recognized even more easily than a conventional way.

As a result, according to the construction of the recording medium onwhich a playback processing procedure is recorded of the presentinvention, the playback processing procedure arranges the displaysshowing the contents of the play list so that the contents becomecontinuous in sequence in a playback sequence from the content which iscurrently being played back at least from a display of an operationelement for instructing the starting or stopping of playback, anddisplays the play list. Thus, it is possible to provide a recordingmedium on which a playback processing procedure capable of recognizing arelationship with a playback process even more easily than aconventional way is recorded.

According to the construction of the recording medium on which aplayback processing procedure is recorded of the present invention, theplayback processing procedure forms a display showing the content whichis currently being played back in a predetermined area of a displayshown, the displays showing the contents of play lists are arranged sothat the contents become continuous in sequence in a playback sequencewith respect to a display showing the content which is currently beingplayed back, and displays the play list. Thus, it is possible to providea recording medium on which a playback processing procedure capable ofrecognizing a relationship with a playback process even more easily thana conventional way is recorded.

According to the construction of the recording medium on which aplayback processing procedure is recorded of the present invention, theplayback processing procedure displays a plurality of play lists, whenthe playback of one piece of content of one play list from among aplurality of play lists is terminated, plays back one piece of contentof another play list, and displays at least the content which iscurrently being played back and the content to be played back next insuch a way that the contents can be mutually distinguished from theother content. Thus, even when a plurality of play lists is selected inunits of contents and is played back, it is possible to provide arecording medium on which a playback processing procedure capable ofrecognizing a relationship with a playback process even more easily thana conventional way is recorded.

The above and further objects, aspects and novel features of theinvention will become more fully apparent from the following detaileddescription when read in conjunction with the accompanying drawings.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 is a perspective view showing a personal computer according to anembodiment of the present invention;

FIG. 2 is a block diagram showing the personal computer of FIG. 1;

FIG. 3 is a plan view showing the menu screen of an application programin the personal computer of FIG. 1;

FIG. 4 is a plan view showing a state in which a display of a cover isremoved the display screen of FIG. 3;

FIG. 5 is a plan view illustrating an area below a display area ARM of amoving picture on the display screen of FIG. 4;

FIG. 6 is a plan view illustrating a play list on the display screen ofFIG. 4;

FIG. 7 is a plan view illustrating automatic play list creation;

FIG. 8 is a plan view illustrating stock trays and the peripheralarrangement thereof on the display screen of FIG. 4;

FIG. 9 is a flowchart illustrating the switching of play lists in thepersonal computer of FIG. 2;

FIG. 10 is a plan view illustrating the switching of play-list displays;

FIG. 11 is a table showing a template;

FIG. 12 is a table showing sound effects which are set in the template;

FIG. 13 is a plan view showing a display screen when a hard playbackstyle is selected;

FIG. 14 is a plan view showing a display screen when a soft playbackstyle is selected;

FIG. 15 is a flowchart showing a cut-out process by the personalcomputer of FIG. 1;

FIG. 16 is a flowchart illustrating the playback of an object to beprocessed which is cut out according to the process of FIG. 15;

FIGS. 17A, 17B, and 17C are diagrams showing the connection of contentsaccording to the process of FIG. 16; and

FIG. 18 is a plan view illustrating editing.

DESCRIPTION OF THE PREFERRED EMBODIMENTS

The preferred embodiments of the present invention will now be describedbelow with reference to the accompanying drawings where appropriate.

(1) Construction of the Embodiments

(1-1) Overall Construction

FIG. 1 is a perspective view showing a personal computer according to anembodiment of the present invention. Similar to a normal notebook-typepersonal computer, this personal computer 1 is constructed in such a waythat, in terms of appearance, an operation key 3, a pointing device 4, amodem terminal 5, etc., are disposed on the main unit 2 side, and aliquid-crystal display panel 7 is disposed on the lid 6 side.Furthermore, for this personal computer 1, a jog dial 8 is disposed onthe side of the main unit 2, and a CCD camera 9 is disposed on the upperportion of the liquid-crystal display panel 7. Here, the jog dial 8 is arotational operation element which includes a switch functions based ona pressing operation, as indicated by the arrow B, so that an operationsimilar to an operation of a mouse, in a predetermined direction, can beperformed by rotating the rotational operation element 8A which isshaped like a circular plate disposed in such a manner as to slightlyproject from the side of the main unit 2, as indicated by the arrow A.

FIG. 2 is a block diagram showing the construction of the personalcomputer 1. In the personal computer 1, various interfaces are connectedto an ISA (Industry Standard Architecture) bus 11, and the operation ofthe operation key 3, irregularities of the power source, and so on arereported via this ISA bus 11 to a central processing unit 12.

More specifically, in the personal computer 1, an I/O controller 13forms, to and from the ISA bus 11, an interface for the operation key 3through the use of alphanumeric keys, etc., an interface for acommunication unit through the use of infrared rays, which is connectedto an infrared port 15, and an interface for a flash memory 16. Thepersonal computer 1 operates by power which is input from an externalpower-supply connector 17 or by a battery 19 under the control of apower-supply charging control circuit 18. The battery 19 is charged bythe power input from the external power-supply connector 17. The I/Ocontroller 13 forms an interface for this power-supply charging controlcircuit 18. Furthermore, the I/O controller 13 forms a driving circuitfor a light-emitting diode (LED) 20 disposed on the operation panel andfurther forms an interface for the stick-type pointing device 4 which isa coordinate input means and an interface for the left, right, andcenter buttons 22 corresponding to the operation elements such as aright click, a left click, etc., of a mouse. Furthermore, the I/Ocontroller 13 forms an interface to and from a rotation detectionsection 26 for detecting an amount of the rotational operation of thejog dial 8, an interface for a full-press/half-press switch 27 fordetecting a pressing operation of this jog dial 8, and an interface fora power-supply switch 28 and an inversion switch 29.

A sound controller 31 is an interface for the input/output of an audiosignal, which is connected to the ISA bus 11. The sound controller 31performs an analog-to-digital conversion process on an audio signalobtained via a microphone 32, and outputs it to the ISA bus 11. Contraryto this, the sound controller 31 performs a digital-to-analog conversionprocess on audio data output to the ISA bus 11 and drives a built-inspeaker 33.

A modem 35 is connected to an ISDN line, etc., via the modem terminal 5.The modem 35, which is connected to the ISA bus 11, forms an interfaceto and from various information networks. As a result of the above, itis possible for the personal computer 1 to obtain desired informationfrom a network such as, for example, the Internet, in response to anoperation of the operation key 3, etc.

In the personal computer 1, this ISA bus 11 is connected to a PCI(Peripheral Component Interconnect) bus 40 via a PCI-ISA bridge 38, andan interface having a high transmission speed is connected to this PCIbus 40. That is, a PC-card interface 41 is connected to the PCI bus 40and forms an interface for a PC card loaded into a PC-card slot 42.Furthermore, an IEEE 1394 interface 43 is similarly connected to the PCIbus 40 so as to form an interface for the IEEE 1394 to and from a deviceconnected to an IEEE 1394 terminal.

A video-capture processing chip 46 is connected to the PCI bus 40 so asto form an interface for the CCD camera 9. The video-capture processingchip 46 is also connected to the CCD camera 9 by an I²C bus. The PCI-ISAbridge 38 forms an interface between the PCI bus 40 and the ISA bus 11,an interface between the PCI bus 40 and a USB (Universal SerialBus)-based terminal (USB terminal) 49, and an interface between the PCIbus 40 and a hard disk drive (HDD). As a result, in the personalcomputer 1, an application program recorded on the hard disk drive 50 isactivated and, furthermore, various information is recorded on the harddisk drive 50. Furthermore, the various information obtained from anetwork in accordance with this application program can be downloaded tovarious devices via the USB terminal 49, and contrary to this, desireddata can be uploaded from various devices.

In the personal computer 1, this PCI bus 11 is connected to a host busHBUS via a host PCI bridge 52, and a cache memory (cache) 55 and thecentral processing unit 12 are connected to this host bus HBUS.Furthermore, a video controller 54 is connected to the host bus HBUS viathe host PCI bridge 52. This allows an image obtained by the CCD camera9 and various GUI information necessary for the operation of thepersonal computer 1 to be displayed on the liquid-crystal display panel7 under the control of the video controller 54 based on the control ofthe central processing unit 12. Furthermore, a random access memory(RAM) 57 is connected to the host bus HBUS via the host-PCI bridge 52,so that a work area for the central processing unit 12 can be allocatedin the random access memory 57. In the personal computer 1, referencesignals of various operation references are generated by a clockgenerator 59, and these signals are supplied to each circuit block.

For the personal computer 1 constructed in this manner, variousapplication programs are executed on a predetermined operating system bya series of processes in the central processing unit 12 in accordancewith the contents recorded on the hard disk drive 50. In the personalcomputer 1, as a result of executing a predetermined application programfrom among the various application programs, a connection to theInternet is made via the modem terminal 5, and various audio data isdownloaded to the hard disk drive 50. Furthermore, audio data recordedon a compact disk is downloaded to the hard disk drive 50 via a CD-ROMdrive connected to the PC-card interface 41.

At this time, in the personal computer 1, audio data is compressed inaccordance with a predetermined format, and this data is recorded on thehard disk drive 50.

Furthermore, audio data together with information about the copyrightfor restricting a copy, an artist's name, an album name, etc., isrecorded on the hard disk drive 50 in accordance with a file format inwhich one piece of music is a unit. Furthermore, as a result of suchsettings at a download time and as a result of selecting audio datawhich is downloaded by a predetermined application program, a play listis created, and the file of this play list is recorded on the hard diskdrive 50. Here, the play list is a file recorded in such a manner thatthe music titles of a plurality of music names which are, for example,selected by a user among pieces of music which are contents recorded onthe HDD 50, can be displayed in a list, and is recorded in such a mannerthat the file of audio data can be specified by the music name recordedin this file. As a result, in the personal computer 1, pieces of musicrecorded on the hard disk drive 50 for each genre desired by the user,such as rock, pop, etc., and for each artist, can be collectivelytest-listened.

(1-2) MusicShaker (Trademark of Sony Corporation)

(1-2-1) Structure of the Menu Screen

FIG. 3 is a plan view showing a menu screen of MusicShaker which is oneof the application programs recorded on the hard disk drive 50.MusicShaker is an application program for playing back pieces of musicrecorded in the play list selected by the user continuously without anyinterruptions.

When the application program of this MusicShaker is selected by theuser, the central processing unit 12 displays this menu screen. Here, onthis menu screen, the play list display areas AR1 and AR2 are formed onboth right and left sides, and an image which creates an image of ametallic-like cover to appear, is displayed in such a manner as to coverthe display areas AR1 and AR2. On the menu screen, in these displayareas AR1 and AR2, the words PLAY LIST 1 and PLAY LIST 2, eachindicating a play-list display area, are displayed. Furthermore, belowthe display areas AR1 and AR2 of each play list, buttons B1 and B2 foropening or closing the display of the cover are disposed, respectively.When these buttons B1 and B2 are operated, the central processing unit12, as shown in FIG. 4, switches the displays of these display areas AR1and AR2, so that play lists P1 and P2 are displayed, respectively.

In contrast, in the upper central portion, a title bar is displayed by adesign integrated with a menu bar. In this title bar, a button forclosing the application program, a button for maximizing the display, abutton for minimizing the display, a button for opening a help file, anda file button for opening a multiple-setting menu of this applicationprogram are displayed. Here, this setting is formed of a setting of thenumber of pieces of music to be auto-loaded into the play list, thesetting for the jog dial 8, and so on.

In addition, in a portion below this title bar, the title of thisapplication program is displayed, and then, a display area ARM of amoving picture for displaying a predetermined moving picture is formed.The central processing unit 12 creates an image of each frame whichforms a moving picture by masking a predetermined still image with aplurality of mask images. Furthermore, the degree of the overlapping ofthe mask images, with respect to this still image, is varied on thebasis of the frequency analysis results of the audio data, thereby amoving picture is displayed by a succession of frames which are createdin this manner. As a result, the central processing unit 12 displays amoving picture which varies in accordance with the atmosphere of thepiece of music which is being played back in the display area ARM ofthis moving picture. In this embodiment, as a result, a moving pictureis displayed in such a manner that a cloud-like object is scatteredradially from the center of this display area ARM.

In addition, on this menu screen, below the display area ARM for themoving picture, play-style change buttons BPS1 to BPS3, and sound-volumeadjustment buttons BVR1 to BVR3 are separately disposed on the right andleft, respectively, and in the center of these, a piece-of-musicinformation display area ARP for a piece of music which is currentlybeing played back is formed. Here, as these areas are magnified andshown in detail in FIG. 5, “soft”, “standard”, and “hard” are assignedto the play-style change buttons BPS1 to BPS3, respectively. The centralprocessing unit 12 changes the style of the playback as a result ofselecting these buttons BPS1 to BPS3. A circular bordering is displayedfor the selected button. This style change will be described later.

Functions for “muting”, “sound volume decrease”, and “sound volumeincrease” are assigned to the volume adjustment buttons BVR1 to BVR3,respectively, and the central processing unit 12 adjusts the volume inresponse to the operation of these operation elements.

In contrast, in the piece-of-music information display area ARP, on thetopmost part, the total playback time from the playback start isdisplayed, and then the title of the piece of music which is currentlybeing played back is displayed. Next, information about the sound volumeis displayed, the icon of the speaker and an×mark are overlappinglydisplayed to show the muting status, and an indicator of the soundvolume is displayed on the right side of this mark. For these displaysregarding the sound volume, when muting is performed, the display isproduced only when the sound-volume adjustment button BVR2 or BVR3 isoperated. In the lowermost part of the piece-of-music informationdisplay area ARP, playback times corresponding to the play lists P1 andP2 are displayed on the right and left, respectively.

On the menu screen (FIG. 3 or 4), below the piece-of-music informationdisplay area ARP, a playback operation button B in the shape of a circleis displayed, and stock trays ST1 and ST2 corresponding to the playlists P1 and P2 are displayed on both sides of this playback operationbutton B, respectively. The stock trays ST1 and ST2 are formed in such away that three music-name display areas in the shape of a hexagon areeach disposed around the button B. Below the playback operation buttonB, a button BE for an editing operation and a play-list status displayarea ARS are formed. For the play-list status display area ARS, symbolsin which the displays of the stock trays ST1 and ST2 are reduced aredisplayed. The details of these buttons will be described later.

FIG. 6 is a detailed plan view showing the play list P1 on the left sidetogether with a display of a peripheral portion thereto. Since thedisplay of the play list P2 on the right side and the peripheral portionthereto is the same, except that the display is formed to be symmetricalwith respect to the display of the play list P1 on the left side and theperipheral portion thereto, a duplicate description is omitted.

Here, in the upper portion of the play list P1, an auto loading buttonBAU is disposed. When this button BAU is operated, the centralprocessing unit 12 selects a music file recorded on the hard disk drive50 in random in order to automatically create a play list, and displaysthis automatically created play list. Here, this random selection isperformed in such a way that the contents are not duplicated in the playlists P1 and P2 and that the contents are not duplicated in one playlist. As a result, even when a large number of pieces of music isrecorded on the hard disk drive 50, the central processing unit 12effectively avoids a complex operation by the user and creates a playlist. A different list can be provided to the user every time.

When a large number of pieces of music is recorded on the hard diskdrive 50, since it takes time to automatically create a play list inthis manner, the central processing unit 12 displays a sub-window shownin FIG. 7, and feeds back the progress status of the automatic creationthrough the display of the bar graph within this sub-window.

Furthermore, in the center of this autoloading button BAU, a button BELfor opening an editing menu of the play list is displayed. When thisbutton BEL is operated, the central processing unit 12 displays apredetermined pull-down menu. In addition, the central processing unit12 performs a play-list creation process or a play-list changing processin response to the operation of the user in this pull-down menu.

Furthermore, below these buttons BAU and BEL, a combo box BX forselecting a play list is displayed. When this combo box BX is opened bythe user, the personal computer displays the file names of theselectable play lists by a pull-down menu, and a selection in this menucauses the play list P1 to be set.

For the play list selected in this manner, as shown in FIG. 8, musicnames are displayed in sequence from the piece-of-music display area ofthe stock tray ST1 in a portion closer to the button B, and theremaining pieces of music (titles) are displayed in sequence in a listfrom the lower portion together with the artist's name, therebydisplaying the play list P1. In the display of the pieces of music inthis play list P1 and the stock tray ST1, the central processing unit 12displays an icon of a flag at the beginning of a piece of music in whichan editing point (to be described later) is set.

When one of the pieces of music is selected and is dragged-and-droppedusing a mouse by the user in this play list P1, in response to thisoperation, the central processing unit 12 interchanges the sequence ofthe displays. Furthermore, in a state in which an application programfor managing files is activated at the same time, when the music namedisplayed by this application program is selected by the user and isdragged-and-dropped to this play list P1, in response to thisdragging-and-dropping operation, this piece of music is added to theplay list P1 which is currently being displayed and the play list P1 isdisplayed. Furthermore, with the play list P2 on the right side, thedisplay of the play list is switched by similar dragging-and-dropping.As a result, the central processing unit 12 makes it possible for theuser to freely change the play list. The process of interchanging thesepieces of music can also be performed with a piece of music displayed onthe stock trays ST1 and ST2.

Furthermore, when a desired piece of music is double-clicked by the userin this play list P1, the central processing unit 12 starts playing backthis piece of music, thereby allowing the user to selectivelytest-listen a desired piece of music and to perform an operation forsetting an editing point (to be described later).

On an initial screen, below this play list P1, a shake button BSH isdisplayed. When this shake button BSH is operated, the centralprocessing unit 12 randomly interchanges the music names displayed inthe play list P1 and the stock tray ST1. As a result, even when aplayback is to be performed according to the same play list, the centralprocessing unit 12 can perform a playback in a different sequence eachtime.

In that manner, in the stock trays ST1 and ST2 (FIG. 8), threemusic-name display areas are formed by a hexagonal border on both rightand left sides corresponding to the play lists P1 and P2, respectively.In each music-name display area, information about each piece of music,excluding the artist from the display of each piece of music in the playlist P1, is displayed. These music-name display areas are disposed insuch a manner that the music-name display areas which are continuous onone side of the hexagonally shaped bordering are adjacent to each otherand are disposed so as to be spread out from the piece-of-musicinformation display area ARP indicating the piece of music which iscurrently being played back and the operation button B which is adisplay of an operation element for instructing the starting/stopping ofplayback toward the play lists P1 and P2 on the right and left. As aresult, the music names can be continuously displayed in sequence in aplayback sequence from the piece-of-music information display area ARPwhich is a display that causes an image of a playback process to appearand the operation button B together with the play lists P1 and P2.

As for the playback operation button B (FIG. 8), a playback/pause buttonBP in the shape of a circle is disposed in the center, and in a portionaround the button BP, a stop button BST, a button BL1 for next for theplay list P1, and a button BL2 for next for the play list P2 aredisposed. Here, the playback/pause button BP is a display for anoperation element for instructing the starting/stopping of playback.When this button BP is clicked using a mouse, the central processingunit 12 starts playing back audio data in accordance with the play listsP1 and P2 or causes this playback to pause. In comparison, the stopbutton BST is disposed below and in the center of the playback/pausebutton BP, whereas the buttons BL1 and BL2 for next are disposedsymmetrically on the corresponding play lists P1 and P2 sides,respectively. When the stop button BST is operated during playback, thecentral processing unit 12 stops playback. Furthermore, when the buttonsBL1 and BL2 for next are operated, the piece of music to be played backnext is skipped on the play lists P1 and P2 sides, respectively, and thedisplays of the play lists P1 and P2 and the stock trays ST1 and ST2 areswitched in such a manner as to correspond to the skip. In this case,when the button BL1 or BL2 for next is operated, this piece of musicwhich is currently being played back is skipped, and the displays of theplay lists P1 and P2 and the stock trays ST1 and ST2 are switched insuch a manner as to correspond to the skip.

As indicated by the arrow B in FIG. 1, when the jog dial 8 is pressed,the central processing unit 12 switches the operation in the same way aswhen the playback/pause button BP is operated. In comparison, asindicated by the arrow A in FIG. 1, when the jog dial 8 is rotated, thecentral processing unit 12 switches the operation in the same way aswhen the button BL1 or BL2 for next is operated. This makes it possiblefor the central processing unit 12 to variously switch the operationsalso by the operation using the jog dial 8 instead of the button BP.

(1-2-2) Playback Process

FIG. 9 is a flowchart showing a processing procedure regarding such aninitial screen of the central processing unit 12 when a playback startis instructed by operating the playback/pause button BP. The centralprocessing unit 12 plays back pieces of music according to two playlists in alternate sequence as a result of executing this processingprocedure, and switches the displays of the play lists P1 and P2 and thestock trays ST1 and ST2 in such a manner as to correspond to thisplayback.

Here, as for the play-list status display area ARS, the centralprocessing unit 12 receives a playback instruction by operating theplayback/pause button BP in a state in which a display, corresponding tothe stock tray ST1 on the play list P1 side, is activated in a defaultstate, and in a state after a stopping or pausing state, the centralprocessing unit 12 receives a playback instruction in a state in which adisplay, corresponding to the stock tray ST1 or ST2 on the side in whicha playback was being performed, is activated.

When the playback instruction is received, the central processing unit12 proceeds from step SP1 to step SP2, whereby the display of the playlist P1 and the stock tray ST1 and the display of the play list P2 andthe stock tray ST2, on a side where playback is performed, are switchedas necessary. Here, this display switching is performed in a case wherethe piece of music which is currently being played back is not displayedin the piece-of-music information display area ARP. Therefore, whenplayback is started from a pause state, the central processing unit 12proceeds to the following step SP3 without performing the processingprocedure of step SP2. In comparison, when playback is started from adefault state, etc., the display of the play list P1 and the stock trayST1 is moved in sequence to the piece-of-music information display areaARP side, thereby switching this display.

In the following step SP3, the central processing unit 12 sets anediting point based on the conditions set by the user with regard to thepiece of music displayed in the piece-of-music information display areaARP, thereby cutting out a portion of this piece of music and setting aplayback object. In the following step SP4, the playback of thisplayback object is started. In the following step SP5, the centralprocessing unit 12 determines whether or not the playback of thiscut-out playback object has been completed. When a “NO” result isobtained in this step, the central processing unit 12 proceeds to stepSP6, whereby it is determined whether or not the playback/pause buttonBP or the stop button BST has been operated. When a “YES” result isobtained in this step, the process proceeds to step SP7, whereby thisprocessing procedure is terminated. When, in contrast, a “NO” result isobtained, the process returns to step SP5. As a result, the centralprocessing unit 12 plays back the playback object which is cut-out instep SP3. When this playback is completed, a “YES” result is obtained instep SP5, and the process proceeds to step SP8.

At this point, the central processing unit 12 switches the play listsfor playback objects, and in the following step SP9, the activation ofthe display, corresponding to the stock tray in the play-list statusdisplay area ARS, is switched so as to correspond to this play-listswitching.

Furthermore, in the following step SP10, the display of the piece ofmusic which is currently displayed in the piece-of-music informationdisplay area ARP is switched to the display of the piece of musicdisplayed at the start of the stock tray of the play list on theselected side, and the display of the play list and the stock tray onthe selected side is moved in sequence to the piece-of-music informationdisplay area ARP side in such a manner as to correspond to this displayswitching. As for the music name displayed thus far in thepiece-of-music information display area ARP, the display positionthereof is switched to the end of the original play list.

When the display is switched in this manner, the central processing unit12 returns to step SP3, whereby a process for cutting out the piece ofmusic displayed in the piece-of-music information display area ARP isperformed once more. As a result, as the flow of the display of themusic names is indicated by the arrow in FIG. 10, the central processingunit 12 alternately selects a piece of music and plays it back withregard to the two play lists, and switches the display of music names ina cyclical sequence in the play list, the stock tray, and thepiece-of-music information display area ARP in such a manner as tocorrespond to this playback, so that audio data is played back insequence in a commonly called “endless” manner in accordance with thetwo play lists.

When switching the display of music names in this manner, as for a pieceof music which is not yet played back, the central processing unit 12displays it by using a color and luminance which give a strongimpression to the user, whereas, as for a piece of music whose playbackis terminated and which is displayed at the end of the play lists P1 andP2, the central processing unit 12 displays it by using a color andluminance which give to the user an impression which is relativelyweaker than that of the display of the piece of music before beingplayed back. Specifically, as for the piece of music which is not yetplayed back, the music name thereof, etc., is displayed using a brightorange color, whereas for a piece of music whose playback has beenterminated, the music name thereof, etc., is displayed using a graycolor.

Furthermore, when the central processing unit 12 displays a piece ofmusic before being played back and a piece of music whose playback hasbeen terminated in this manner and performs playback in sequence, astate is reached in which all the music names displayed in the playlists P1 and P2 and the stock trays ST1 and ST2 are the pieces of musicwhose playback have been terminated. Then, for the side in which onlythe pieces of music whose playback have been terminated are present inthis manner, the central processing unit 12 resets all the pieces ofmusic to pieces of music which are not yet played back, and switches thedisplay of these music names, etc.

(1-2-3) The Style During Playback of a Piece of Music

The central processing unit 12 switches the atmosphere during playbackof the contents to be cut out and played back in this manner in responseto an operation using the play list change buttons BPS1 to BPS3, andchanges the design of the menu screen in response to this switching.

More specifically, the play list change buttons BPS1 to BPS3 areoperation elements for selecting the style of playback according to ahard, standard, and soft atmosphere, respectively. In this applicationprogram, as shown in FIGS. 11 and 12, a template for setting theatmosphere of the playback is provided in such a manner as to correspondto each of these operation elements BPS1 to BPS3.

Here, for volume parameters which are set in these templates, parameterswhich set a gain when audio data is processed are provided so that thevolume becomes progressively weaker in such a manner as to correspond tothe style of playback according to a hard, standard, and softatmosphere. Furthermore, for equalizer parameters, parameters areprovided which correct the frequency characteristics of the audio dataand which obtain frequency characteristics that accentuate a high andlow tone in a playback style based on a hard atmosphere. Furthermore,for a playback style based on a standard atmosphere, parameters areprovided so that substantially flat frequency characteristics areobtained, and for a playback style based on a soft atmosphere,parameters are provided so that frequency characteristics are obtainedin which a high and low tone are suppressed.

In contrast, as for sound field parameters, parameters for reverberationto be added to the audio data are provided in such a way that, for aplayback style based on a hard atmosphere, an atmosphere is created asif a recording is being test-listened in a small room; for a playbackstyle based on a standard atmosphere, a recording is being test-listenedin a stadium; and for a playback style based on a soft atmosphere, anatmosphere is created as if a recording is being test-listened in alarge hall.

In this embodiment, the playback is performed in such a way that a soundeffect (to be described later) is interposed between playback objectswhich are cut out in the above-described step SP3, and for the switchinginformation, information about this cut-out process and informationabout the connection of a sound effect are specified. Of them, theplayback reference time is a time of a playback reference of a playbackobject which is cut out from each content, and the following change timeis a time for giving a change to this playback reference time. For aplayback style based on a hard atmosphere, the playback reference timeand the change time are set to 20 seconds and 1 second, respectively,and the central processing unit 12 sets a playback object in eachcontent by irregularly varying the cut-out time each time a cut-outprocess is performed in the range of 19 (20−1) seconds to 21 (20+1)seconds. In contrast, for a playback style based on a standardatmosphere, the playback reference time and the change time are set to40 seconds and 5 seconds, respectively, and the central processing unit12 sets a playback object in each content by irregularly varying thecut-out time each time a cut-out process is performed in the range of 35(40−5) seconds to 45 (40+5) seconds. Furthermore, for a playback stylebased on a soft atmosphere, the playback reference time and the changetime are set to 60 seconds and 10 seconds, respectively, and thus, thecentral processing unit 12 sets a playback object in each content byirregularly varying the cut-out time each time a cut-out process isperformed in the range of 50 (60−10) seconds to 70 (60+10) seconds.

In comparison, a transition time is a transition time when sound effectswhich are interposed between contents and the contents are connected bya cross-fade. For a playback style based on a hard atmosphere, thetransition time is set to 0 seconds, whereas for a playback style basedon a standard and soft atmosphere, the transition time is set to 2seconds and 5 seconds, respectively. As a result, for a playback stylebased on a hard atmosphere, the playback object and the playback of thecontent are switched instantly by a cut, whereas for a playback stylebased on standard a and soft atmosphere, the contents and the soundeffect are gradually switched, and at this time, the switching isperformed at a more gradual speed for a soft case.

The GUI information is the design information of the above-describedmenu screen, and coordinate values at which buttons, etc., are disposed,the background, bit-map data of the buttons, etc., are entered so that amenu screen corresponding to a playback style based on a hardatmosphere, a playback style based on a standard atmosphere, and aplayback style based on a soft atmosphere can be displayed. Furthermore,still pictures used for creating a moving picture, switching informationfor mask images, settings when these are made to perform a relativemotion based on the frequency analysis results are assigned to themoving picture parameters.

In that manner, the above-described menu screen of FIG. 1 is created bythe GUI information and the moving picture parameters when a playbackstyle based on a standard atmosphere is selected, and in comparison,FIG. 13 shows a menu screen when a playback style based on a hardatmosphere is selected. For this menu screen, based on the hardatmosphere, the moving picture is displayed by a larger screen, and thestock trays ST1 and ST2 are disposed upside down with respect to astandard case. Furthermore, large buttons are displayed, therebyallowing a desired operation to be reliably performed even if they areoperated carelessly. The background is formed in such a way that it isdivided into large areas by an oblique boundary line, and vibrant colorsare placed in each divided area. The moving picture is formed in such away that a cloud-like object having a sharp shape of vibrant color isspread out radially from the center. As a result, in this case, a strongimpression is given to the user. Also, for this playback style based ona hard atmosphere, displays showing the contents of the play lists arearranged toward the display of operation elements and the display of thepiece of music which is currently being played back. This makes itpossible to recognize the relationship with the playback process evenmore easily.

In comparison, FIG. 14 shows a menu screen when a playback style basedon a soft atmosphere is selected. In this case, the menu screen isformed by a soft design based on horizontal and vertical lines. In thiscase, the stock trays ST1 and ST2 are omitted and the play lists P1 andP2 are directly disposed in the vicinity of the operation element B, andthe display of the music names, etc., in the play lists P1 and P2 iscyclically displayed according to the switching of the contents. Alsofor the moving picture, a cloud-like object with a soft color and shapeis formed in such a manner as to be scattered radially from the center.As a result, in this case, a gentle impression is given to the user.

In comparison, a switching-time sound effect (FIG. 12) is a sound effectwhich is played back immediately after switching when, during playback,the playback style is switched to a playback style based on a hardatmosphere, a playback style based on a standard atmosphere, and aplayback style based on a soft atmosphere, and a sound effectcorresponding to each playback style is entered, respectively. Incontrast, sound effect 1 to sound effect 10 are sound effects which areinterposed between the contents during playback based on the same style,and 10 types of sound effects are entered for each style. The soundeffects 1 to 10 are sound effects of 5 seconds, 10 seconds, and 20seconds for a playback style based on a hard atmosphere, for a playbackstyle based on a standard atmosphere, and for a playback style based ona soft atmosphere, respectively. The switching-time sound effect issound effect which is longer than the corresponding sound effects 1 to10.

For a playback style based on a hard atmosphere, the sound effects 1 to10 and the switching-time sound effect are formed in such a way thatpredetermined plosives are placed before and after a voice by a male,and short phrases such as “Take it easy” or “That's good” are assignedto the voice of this male. In comparison, for the switching-time soundeffect, a phrase of a certain length is assigned so that a style changecan be easily recognized. As a result, for a playback style based on ahard atmosphere, it is possible to create an atmosphere as if a maledisk jockey (DJ) is quickly introducing a rock song by a digest.

In comparison, for a playback style based on a standard atmosphere, thesound effects 1 to 10 and the switching-time sound effect are formed insuch a way that an oscillating tone while tuning a radio is disposedbefore and after the voice of the male. For the sound effects 1 to 10, arelatively long phrase is assigned to the voice of this male, and forthe switching-time sound effect, a phrase of a certain length isassigned so that a style change can be easily recognized. As a result,for a playback style based on a standard atmosphere, it is possible tocreate an atmosphere as if a radio DJ is introducing a pop song by adigest.

In comparison, for a playback style based on a soft atmosphere, thesound effects 1 to 10 and the switching-time sound effect are formed bya voice of a female. For the sound effects 1 to 10, a relatively longphrase is assigned to the voice of this female, whereas for theswitching-time sound effect, similar to the hard case, a phrase of acertain length is assigned so that a style change can be easilyrecognized. As a result, for this playback style based on a softatmosphere, it is possible to create an atmosphere as if a female DJ isintroducing a piece of easy listening music by a digest in an FMbroadcast.

In that manner, when the play-style change buttons BPS1 to BPS3 areoperated by the user, the central processing unit 12 sets the operatingconditions of the signal processing system in accordance with acorresponding template, thereby cutting out audio data in sequenceaccording to the atmosphere selected by the user and playing it back,and switches the display of the screen. In contrast, when theseoperations are performed during playback, the operating conditions ofthe signal processing system and the display screen are switched in asimilar manner, and the switching-time sound effect is interposed so asto switch the playback object.

FIG. 15 is a flowchart showing a cut-out process in which a templatewhich is set in this manner is used. In this cut-out process, thecentral processing unit 12 proceeds from step SP11 to step SP12, wherebyit is determined whether or not an in-point is set in the content of anobject to be processed by a series of processes from the operation ofthe button BE for an editing operation (to be described later). When a“NO” result is obtained in this step, the central processing unit 12proceeds to step SP13, whereby the length of the piece of music, whichis the content, is measured. Here, this measurement is performed byreading, for example, the time information which is set in the audiodata.

The central processing unit 12 then proceeds to step SP14, whereby anin-point is randomly set on the basis of the time information which isread in this manner and the playback reference time of the template. Inthis case, the central processing unit 12 creates the time informationof the in-point by multiplying a random number in a range of, forexample, 0 to 1, by the playback time obtained by subtracting theplayback reference time from the playback time of the entire piece ofmusic, and sets an in-point so that this content can be played back forat least the playback reference time.

When the in-point has been set in this manner, or when a “NO” result isobtained in step SP12, the central processing unit 12 proceeds to stepSP15, whereby the central processing unit 12 randomly calculates theplayback time in accordance with the template. In this step, thisplayback time is calculated in such a way that, for example, a randomnumber in a range of −1 to 1 is multiplied by the change time of thecorresponding playback style and the multiplication result is added tothe playback reference time.

In the following step SP16, the central processing unit 12 adds the timeinformation calculated in step SP15 to the time information of thein-point which is set in step SP14, thereby calculating the timeinformation of an out-point in order to set the out-point. In thefollowing step SP17, the central processing unit 12 determines whetheror not this out-point has been set beyond the end of the piece of music.When a “YES” result is obtained in this step, the process returns tostep SP12, whereby the editing point is set once more. When, incontrast, a “NO” result is obtained, the process proceeds to step SP18,and this processing procedure is terminated.

As a result, the central processing unit 12 cuts out a different portionand sets it as a playback object for each playback time. In the personalcomputer 1, as a result, even when playback is performed repeatedly inaccordance with the same template, a different impression is given tothe user for each playback time, thereby preventing the user frombecoming bored.

FIG. 16 is a flowchart showing the processing procedure of the centralprocessing unit 12 with regard to a relationship with a playback objectwhich is cut out in this manner. When a playback is instructed, thecentral processing unit 12 proceeds from step SP31 to step SP32, wherebyplayback conditions are set in accordance with a template. Here, thesettings of these playback conditions are the settings of the frequencycharacteristics of an equalizer, filters for creating a sound field,etc. In the following step SP33, the central processing unit 12 loadsthe corresponding audio data so that the playback can be started fromthe in-point set in accordance with the processing procedure of FIG. 15,thereby locating the beginning of this piece of music.

Then, the central processing unit 12 proceeds to step SP34, whereby theplayback of this content is started, after which, in step SP35, it isdetermined whether or not an out-point has been reached. When a “NO”result is obtained in this step, the central processing unit 12 proceedsto step SP36, whereby it is determined whether or not a changing of aplay list is instructed from the user. When a “NO” result is obtained inthis step, the central processing unit 12 proceeds to step SP37, wherebyit is determined whether or not the stop button BST or theplayback/pause button BP has been operated. When a “YES” result isobtained, the central processing unit 12 proceeds to step SP38, wherebythis processing procedure is terminated. When, in contrast, a “NO”result is obtained, the central processing unit 12 returns to step SP35.

As a result, from when the playback of the playback object is starteduntil the playback of this playback object is completed, the centralprocessing unit 12 repeats the processing procedure of steps SP35, SP36,and SP37. When the content of this playback object is played back up tothe out-point, a “YES” result is obtained in step SP35, and thus, thecentral processing unit 12 proceeds to step SP39. In this step, thecentral processing unit 12 selects one sound effect from the soundeffects 1 to 10 of the corresponding template based on a randomselection, and in the following step SP40, the central processing unit12 starts playing back this sound effect. At this time, the centralprocessing unit 12 starts playing back the sound effect in such a manneras to be connected by a cross-fade in accordance with a transition timeset in the template, and in contrast with this, terminates the playbackof the content.

When the playback of the sound effect is started in this manner, thecentral processing unit 12 proceeds to step SP41, whereby it isdetermined whether or not the playback of the sound effect has beenterminated. When a “NO” result is obtained, step SP41 is repeated. When,in contrast, a “YES” result is obtained, the process proceeds to stepSP33, whereby the beginning of the new content is located. As a resultof repeating these processes, the central processing unit 12, as shownin FIG. 17, randomly cuts out a playback object from each content in arange of 19 to 21 seconds (part (1) of FIG. 17A), and plays back thiscut-out playback object by connecting it with a sound effect of a shorttime T (part (2) of FIG. 17A) when a playback based on a hard atmosphereis selected. At this time, this sound effect is randomly selected from10 types of sound effects 1 to 10 (H1 to H10) and is interposed inbetween.

As a result, in this case, the central processing unit 12 plays back thecontents according to two play lists in sequence alternately with acolorful atmosphere so that the user does not become bored.

In contrast, when a playback based on a standard atmosphere is selected,a playback object is randomly cut out from each content in a range of 35to 45 seconds (part (1) of FIG. 17B), and this cut-out playback objectis played back in such a way that it is connected with a sound effect bya cross-fade for a transition time t of 2 seconds (part (2) of FIG.17B). Furthermore, at this time, this sound effect is randomly selectedfrom 10 types of sound effects 1 to 10 (ST1 to ST10). As a result, inthis case, the central processing unit 12 plays back the contentsaccording to two play lists in sequence alternately by a slightlysubdued atmosphere so that the user does not become bored.

When playback based on a soft atmosphere is selected, the playbackobject is randomly cut out from each content in a range of 50 to 70seconds (part (1) of FIG. 17C), and this cut-out playback object isconnected to a sound effect by a cross-fade for a transition time t of 5seconds and is played back (part (2) of FIG. 17C). Furthermore, at thistime, this sound effect is randomly selected from 10 types of soundeffects 1 to 10 (SF1 to SF10). As a result, also in this case, thecentral processing unit 12 plays back contents according to two playlists in sequence alternately with a subdued atmosphere so that the userdoes not become bored.

When a change of a play style is instructed from the user duringplayback, the central processing unit 12 proceeds from step SP36 to stepSP42 (FIG. 16). In this step, the central processing unit 12 loadsvarious parameters and information from the template corresponding tothe play style selected by the user and switches the correspondingsettings. That is, the central processing unit 12 switches theatmosphere of the playback result so as to correspond to the play styleas a result of the change of the settings of the equalizer, the soundvolume, and the sound field. Furthermore, the settings of the GUIinformation and the moving picture are switched to cause the atmosphereof the display screen to correspond to the play style.

Then, the central processing unit 12 proceeds to step SP43, whereby theplayback of the corresponding sound effect at the switching time isstarted, and the process proceeds to step SP41. As a result, when achange of a play style is instructed from the user during playback, thecentral processing unit 12 instantly switches the atmosphere of theplayback, and plays back a sound effect for a long time so that thisswitching can be recognized. Furthermore, thereafter, the contentsaccording to two play lists are played back in sequence alternatelyaccording to the changed play style.

FIG. 18 is a plan view showing the play-list status display area ARStogether with the peripheral components. When a button BE for an editingoperation is operated, the central processing unit 12 displays this menufor editing in the play-list status display area ARS. When one of thepieces of music is selected by the user in the play lists P1 and P2 andthe stock trays ST1 and ST2 in a state in which this menu for editing isbeing displayed, the personal computer 1 sets this piece of music as anediting object and receives a setting of the in-point in this piece ofmusic.

Here, in this menu for editing, a rectangular display H2 showing thecurrent playback position is displayed in such a manner as to overlap abar-shaped display Hi indicating the total length of the piece of music.When the in-point has been set, a flag icon M1 indicating the set placeof the in-point is displayed. This flag icon M1 is in the same shape asthe icon displayed in the music name in which the editing point is setin the play lists P1 and P2. This makes it possible for the personalcomputer 1 to facilitate user's understanding.

Furthermore, below this bar-shaped display H1, a display of the timeinformation indicating the playback place, a button BE1 for setting anin-point, and a display of the time information indicating the placewhere the in-point is set are disposed. In addition, below these, a stopbutton BE2, a playback button BE3, a button BE4 for a playback from thein-point, and a button BE5 for releasing the setting of the in-point aredisposed. Furthermore, below these, an OK button BE6 and a cancel buttonBE7 are disposed.

When a piece of music is selected by the user and the playback buttonBE3 is operated, the central processing unit 12 starts playing back fromthe start of this piece of music and causes the rectangular display H2to be moved in sequence. When this rectangular display H2 is beingdragged by a mouse, the current playback place is changed according tothis movement. Furthermore, when the stop button BE2 is operated, theplayback is stopped, whereas, when the in-point setting button BE1 isoperated, the current playback position is set as the in-point.

In comparison, when the button BE4 for a playback from the in-point isoperated, the playback is started from the in-point which is set in thismanner. When a flag icon M1 is dragged by a mouse, the position of thein-point is changed according to this movement. When the button BE5 forreleasing the setting of the in-point is operated, the setting of thein-point is released. In the personal computer 1, this makes it possiblefor the user to set the in-point and to confirm the setting of thein-point. When the in-point is set in this manner and the OK button BE6is operated by the user, the central processing unit 12 enters thesetting of the in-point in the corresponding play list. In comparison,when the cancel button BE7 is operated, the entry of the in-point set inthis manner becomes invalid.

As a result, in the personal computer 1, it is possible to individuallyset playback from a place intended by the user instead of using anautomatically cut-out playback.

(2) Operation of the Embodiments

In the above construction, in the personal computer 1 (FIGS. 1 and 2),for example, as a result of connecting an interface or as a result ofplayback of a compact disk, various audio data is downloaded onto thehard disk drive 50. Furthermore, as a result of such settings at thedownload time and as a result of selecting audio data downloaded by apredetermined application program, a play list is created in which, forexample, the contents are formed into a list for each genre and artistdesired by the user.

In the personal computer 1, when MusicShaker, which is one of theapplication programs, is activated, a menu screen by a design, in whicha moving-picture display area ARM, the stock trays ST1 and ST2, thebutton B, etc., are disposed in the center, and the other portions arecovered with a cover, is displayed (FIG. 3). When the predeterminedbutton B1 or B2 on this menu screen is operated, the display of thecover is removed, and the display of the play lists P1 and P2 appears(FIG. 4).

When an autoloading button BAU is operated in this state (FIG. 6), thecontents recorded on the hard disk drive 50 are randomly grouped in thisapplication program and a play list is created (FIG. 7), and the musicnames in accordance with this template are displayed in sequence in theplay list P1 or P2 and the stock tray ST1 or ST2 (FIGS. 6 and 8).Furthermore, when a play list, which has been entered in advance, isselected, as a result of operating a combo box BX, etc., the music namesin accordance with this template are displayed in sequence in the playlist P1 or P2 and the stock tray ST1 or ST2. Furthermore, as a result ofthe operation of the shake button BSH and various operations such asdragging-and-dropping with a mouse in a state in which the music namesare displayed in this manner and furthermore as a result of a processperformed by operating a button BEL which opens the editing menu, theplay list is updated or created, or the display of the music names inthe play list P1 or P2 and the stock tray ST1 or ST2 is changed orupdated.

In such a display, the personal computer 1 arranges and displays thedisplays showing the contents of the play list so that the contentsbecome continuous in sequence in a playback sequence from the contentwhich is currently being played back with respect to the piece-of-musicinformation display area ARP, which is a display showing the contentwhich is currently being played back, and with respect to a button BP,which is at least a display of an operation element for instructingstarting of playback or a display of an operation element forinstructing stopping of playback.

In addition, when playback is instructed as a result of the operation ofthe playback button BP in a state in which the music names are displayedin the two play lists P1 and P2 and the corresponding stock trays ST1and ST2 in this manner, the contents are switched in this display orderand are played back, and furthermore, in response to this switching ofthe contents, the display showing the contents in the play lists P1 andP2 and the corresponding stock trays ST1 and ST2 is switched (FIG. 9).Also, the play lists for the objects of playback are alternatelyswitched, and the content whose playback have been terminated arechanged to an unnoticeable color and displayed at the end of the playlist. As a result, the display of the music names is switched inresponse to the switching of the piece of music in such a way that themusic names cycle on the play lists P1 and P2 side around thepiece-of-music information display area ARP and the button BST, whichgives the user an impression of a playback process (FIG. 10).

As a result, it is possible for the user to recognize the relationshipwith the playback process even more easily than a conventional way, suchas which piece of music is currently being played back, which piece ofmusic is to be played back next, and in what place the user's preferredpiece of music is to be played back. Thus, the ease of use can becorrespondingly improved even more.

Furthermore, by placing the piece of music whose playback has beenterminated at the end, playback can be performed repeatedly, and sincethe display of the piece of music whose playback has been terminated isswitched at this time, it is possible to recognize the start of the playlist without mistake.

Furthermore, as a result of alternately playing back two types of playlists in this manner, it is possible to play back limited play lists invarious combinations. As a result, a case occurs in which pieces ofmusic which are not desired by the user are continuously played backcontinuously. This makes it possible to perform a playback in acombination of various pieces of music by a playback method that willpleasantly surprise the user and with a high degree of freedom.

Since at least the content which is currently being played back and thecontent to be played back next are displayed in such a manner that thecontents can be mutually distinguished from the other content on thebasis of such arrangement of the two play lists and the two stock trays,and playback is switched by mixing with a cross-fade in which soundeffect is interposed in between, it is possible to clearly display whichpiece of music is being processed, and the ease of viewing for the usercan be correspondingly improved to improve the ease of operation.Furthermore, by making it possible to perform an operation of settingthe in-point, etc., in each play list, an editing operation having ahigh degree of freedom can be performed.

Since the contents of the two play lists are alternately played back inthis manner, in the personal computer 1, when the play-style changebuttons BPS1 to BPS3 are operated (FIG. 5), the operating conditions ofthe signal processing system are switched in accordance with the record(FIG. 11) of the template corresponding to the operation button. As aresult, when a playback style based on a hard atmosphere is selected,each content is played back in an atmosphere in which a high tone and alow tone are accentuated by a relatively high sound volume and as iftest-listening in a small room. When a playback style based on a softatmosphere is selected, each content is played back in an atmosphere inwhich a high tone and a low tone are suppressed by a relatively lowsound volume and as if test-listening in a large hall. Furthermore, inthe standard case, each content is played back in an atmosphere which isbetween the hard and soft cases. As a result, it becomes possible tosimply and reliably perform the setting of each parameter of the signalprocessing system by one operation.

Furthermore, in response to these switchings, the design of the displayscreen is switched in accordance with the GUI information which is setin each template and the moving-picture information (FIGS. 13 and 14).As a result, in the personal computer 1, it is also possible to easilychange the setting of the display screen. For the user, not only can theplayback results be test-listened, but also the play style selected bythe user can be confirmed via the display screen, thus improving theease of use. Furthermore, for a user unfamiliar with the operations of apersonal computer, it is possible to easily change the design and tovariously switch the playback atmosphere. This makes it possible toeasily and reliably create an atmosphere matching the user's vision.

Since each content is played back in this manner, in the personalcomputer 1, an in-point and an out-point are set in each content inaccordance with a cut-out pattern recorded in the template of this playstyle, and a playback object is cut out (FIGS. 15 and 16). As a result,in the personal computer 1, portions to be partially played back are setin each content of a group of contents according to the play list, andthe cut-out playback objects, which are portions to be played back, arecontinuously played back continuously in sequence. As a result, it ispossible for the personal computer 1 to play back contents with a methoddifferent from a conventional method.

At this time, in the personal computer 1, an in-point and an out-pointare randomly set so that different portions are cut out each time of acut-out in accordance with a time setting according to the play style,and playback is performed in such a way that a sound effect isinterposed between playback objects. As a result, the setting of thissound effect allows these groups of contents to be played back like adigest in a radio, etc. So, the user does not become bored.

A sound effect to be interposed between contents is determined based ona random selection from a plurality of types of sound effects 1 to 10,and the cut-out time is irregularly varied in accordance with thetemplate. So, the user does not become bored.

Furthermore, since the setting of the cut-out time differs according tothe play style, a cut-out pattern is selectable according to the playstyle. Also, the sound effect is switched according to this selection ofthe cutout pattern, thereby allowing continuous contents to be cut outand played back according to the playback style corresponding to theatmosphere selected by the user.

In the personal computer 1, such a connection between the playbackobject and the sound effect is made and played back by mixing with across-fade. As a result, a sense of incongruity, when each content isplayed back by such a digest format, is prevented. Furthermore, thiscross-fade causes the transition time to be switched according to eachplayback style, and the sound effect and the contents can be connectedby a connection appropriate for the playback style selected by the userand can be played back.

As a result of the above, if playback is performed in this manner, it isnot required to test-listen the same place with the same sound effect bythe relationship before and after the same contents even if it islistened repeatedly many times, so that the user does not become bored.Furthermore, it is also possible for the user to test-listen from themiddle of a piece of music without using any operations for each pieceof music, and playback can be continuously performed without cutting offthe sound as a result of the interposition of the sound effect, so thatstage effects in a television, radio program, etc., can also beexpected.

For performing playback in this manner, a case is conceived in which theuser does not desire a playback with such an irregular cutout. In thiscase, by opening the edit menu by operating the button BE for an editingoperation (FIG. 18), an in-point is set in a desired place, and eachcontent can be played back from this in-point in accordance with avariously changing playback time. As a result, also for such user, theuser's desires can be taken into account so that the user does notbecome bored.

Furthermore, in a case where the playback style is switched whileplayback is being performed according to a predetermined playback style,the signal processing system and the display are switched so as tocorrespond to this switching, and a switching-time sound effect, whichis special for such a switching time, of a longer playback time, incomparison with the other sound effects, is interposed between thecontents. As a result, it is possible for the user to confirm theswitching of the playback style by just listening to it.

According to the above construction, each content is cut out and iscontinuously played back based on a predetermined cut-out pattern inwhich at least a playback time is set. As a result, it is possible toplay back the contents by a method different from a conventional method,and the ease of use can be improved correspondingly.

Furthermore, by performing a playback in such a way that a predeterminedsound effect is interposed between portions to be partially played backwhich are cut out in this manner, this setting of the sound effectcauses these contents to be played back as if being a digest in a radio,etc., thereby making it possible to prevent the user from becomingbored.

Furthermore, at this time, by randomly selecting the sound effect, it ispossible to prevent the user from becoming bored.

Also, by irregularly varying the cut-out time, it is possible to preventthe user from becoming bored.

Furthermore, by making this cut-out pattern selectable, it is possibleto cut out contents according to the preference of the user.

Furthermore, by switching the sound effect according to the selection ofthis cut-out pattern, by switching the connection with the sound effect,or by switching the sound effect during playback, such as a sound field,it is possible to play back contents according to the preference of theuser.

Furthermore, by switching the conditions of the operation of theprocessing system which processes contents, and by switching the designof the display screen in response to the switching, it is possible tosimplify the setting, etc., of the display screen.

Furthermore, at this time, by selecting a corresponding list from amonga plurality of lists in response to an operation of this operationelement, and by switching the conditions of the operation of theprocessing system according to the selected list, a mere selection of adesired list allows various types of settings to be changed, and varioustypes of settings can be simplified correspondingly.

Furthermore, by producing a display by arranging the displays showingthe contents of the play lists so that the contents become continuous insequence in a playback sequence from the content which is currentlybeing played back from the display of an operation element which causesan image of a playback process to appear or from the display showing thecontent which is currently being played back, it is possible torecognize the relationship with the playback process even more easilythan a conventional way.

Furthermore, at this time, by placing the display showing the contentwhose playback has been terminated at the end of the play list display,even when a playback is performed repeatedly, it is possible torecognize the relationship with the playback process even more easilythan a conventional way.

Since the display showing a piece of content is the name of the content,the present invention can be applied to the playback of audio data, andthe content can be easily recognized.

Furthermore, in a case where the playback of one piece of content of oneplay list from among a plurality of play lists is terminated, one pieceof content of another play list is played back, and at least the contentwhich is currently being played back and the content to be played backnext are displayed so that the contents can be mutually distinguishedfrom the other content. Thus, even when a plurality of play lists isselected in units of contents and is played back, the relationship withthe playback process can be recognized even more easily than aconventional way.

In addition, by forming such a display capable of being distinguishedfrom the other content by arranging the displays showing the contentsfrom a display of an operation element which causes an image of aplayback process to appear or from a display showing the content whichis currently being played back for each play list, the relationship withthe playback process can be recognized even more easily than aconventional way.

Other Embodiments

In the above-described embodiment, a case is described in which contentsare cut out by changing a cut-out method according to a playback style,and a sound effect is interposed in between, and a playback is performedaccording to an atmosphere corresponding to the play style. However, thepresent invention is not limited to this case, and each content may besimply cut out for a playback.

Although in the above-described embodiment, a case is described inwhich, for the content desired by the user, an in-point can be set, thepresent invention is not limited to this case, and can be widely appliedto a case in which these settings are not received and to a case inwhich an out-point can be set as well with regard to the content desiredby the user.

Although in the above-described embodiment, a case is described inwhich, for the switching of the operation of the processing systemaccording to a play style, cut-out conditions, sound volume, soundquality, sound effect, conditions of connection, etc., are switched, thepresent invention is not limited to this case, and can be widely appliedto a case in which only the frequency characteristics are simplyswitched.

Although in the above-described embodiment, a case is described in whichthe design of the display screen is switched by switching thearrangements of buttons, etc., and the background, the present inventionis not limited to this case, and the design of the display screen may beswitched by switching, for example, only the background.

Although in the above-described embodiment, a case is described in whichcontents are cut out by changing the cutout method according to a playstyle and a sound effect is interposed in between, and playback isperformed according to an atmosphere corresponding to the playbackstyle, the present invention is not limited to this case, and can bewidely applied to a case in which all the pieces of music of eachcontent are played back.

Although in the above-described embodiment, a case is described inwhich, for the content whose playback has been terminated, the displayis switched and the content is displayed at the end of the play list onthe assumption that playback is repeated, the present invention is notlimited to this case, and, for example, this process may be omitted foronly one playback. Furthermore, even when the content is placed at theend, the switching of the display may be stopped as necessary.

Although in the above-described embodiment, a case is described in whichtwo play lists are alternately played back, the present invention is notlimited to this case, and can be widely applied to a case in which oneplay list is played back.

Although in the above-described embodiment, a case is described in whicha play list is edited as necessary, and furthermore, a case is describedin which playback is performed on the basis of the edited play list, thepresent invention is not limited to this case, and can be widely appliedto a case in which a list of music names recorded in the TOC (Table ofContents) of one recording medium, such as, for example, a compact disk,is used as a play list, and to a case in which a record of various typesof management tables, etc., for managing the contents inside a personalcomputer, is used as a play list.

Although in the above-described embodiment, a case is described in whicha play list is displayed, and the display is switched, the presentinvention is not limited to this case, and can be widely applied to acase in which a play list is only simply displayed, and also to a casein which a play list is not displayed.

Although in the above-described embodiment, a case is described in whichcontents composed of audio data are played back, the present inventionis not limited to this case, and can be widely applied to a case inwhich contents are composed of, for example, video data. In this case, acase is conceived in which the interposition of a sound effect isstopped, and the cut-out video image is connected by a cross-fade, awipe, etc. Furthermore, instead of or in addition to the display showingthe contents, such as music names in a play list, a still pictureextracted from each content may be used.

Many different embodiments of the present invention may be constructedwithout departing from the spirit and scope of the present invention. Itshould be understood that the present invention is not limited to thespecific embodiments described in this specification. To the contrary,the present invention is intended to cover various modifications andequivalent arrangements included within the spirit and scope of theinvention as hereafter claimed. The scope of the following claims is tobe accorded the broadest interpretation so as to encompass all suchmodifications, equivalent structures and functions.

1. A playback apparatus for playing back contents by sequentiallyswitching the contents in accordance with first and second play listsidentifying the contents that are recorded, the playback apparatuscomprising: display means for producing a display such that displaysshowing contents in the first and second play lists are arranged so thatthe contents are continuous in sequence in a playback sequence from acontent that is currently played back at least from one of a display ofan operation element for instructing a starting of playback and adisplay of an operation element for instructing a stopping of playback;and switching means for switching between the arrangements of thedisplays of the first and second play lists showing the contents inresponse to the switching of the playback of the content, wherein adisplay showing content whose playback is terminated is placed at an endof the arrangement of the contents forming the first or second play listfrom which it was played.
 2. The playback apparatus according to claim1, wherein a display showing the content is a name of the content. 3.The playback apparatus according to claim 1, wherein the content isaudio data.
 4. A playback apparatus for playing back contents bysequentially switching the contents in accordance with a play listidentifying the contents that are recorded, the playback apparatuscomprising: display forming means for forming a display showing a pieceof content that is currently played back and a piece of content thatwill be played back next in a predetermined area of a display section;display means for producing a display such that displays showingcontents of the play list are arranged so that the play list contentsbecome continuous in sequence in a playback sequence with respect to thedisplay showing the content that is currently played back; and switchingmeans for switching the arrangement of the display showing the contentthat is currently played back and the display showing the contents ofthe play list, wherein a display showing content whose playback isterminated is placed at an end of the arrangement of the contentsforming the play list.
 5. The playback apparatus according to claim 4,wherein a display showing the content is a name of the content.
 6. Aplayback apparatus for playing back contents in sequence in accordancewith first and second play lists identifying the contents to be playedback are recorded, the playback apparatus comprising: play list displaymeans for displaying the first and second play lists; playback means forswitching between displays of the first and second play lists and forplaying back one piece of content of the second play list when aplayback of one piece of content of the first play list is terminated;and current play display means for displaying the piece of content thatis currently played back and the piece of content to be played back nextsuch that the contents are mutually distinguished from other content,wherein a display showing a piece of content whose playback isterminated is placed at an end of the corresponding arrangement.
 7. Theplayback apparatus according to claim 6, further comprising: firstdisplay means for producing a display such that displays showingcontents of the first and second play lists are arranged so that thecontents are continuous in sequence in a playback sequence from contentthat is currently played back at least one of from a display of anoperation element for instructing the starting of playback and from adisplay of an operation element for instructing a stopping of playback;and second display means for displaying at least the piece of contentthat is currently being played back and the content to be played backnext such that the contents are mutually distinguished from othercontent.
 8. The playback apparatus according to claim 6, furthercomprising: display forming means for forming a display showing thecontent that is currently played back in a predetermined area of adisplay section; continuous display means for producing a display suchthat displays showing contents of the first and second play lists arearranged so that the contents become continuous in sequence in aplayback sequence with respect to the display showing the content thatis currently being played back; and distinguishing display means fordisplaying at least the content that is currently being played back andthe content to be played back next such that the contents can bemutually distinguished from the other content.
 9. The playback apparatusaccording to claim 6, wherein the content is audio data and the playbackresults of the continuous contents are mixed and output.
 10. A playbackmethod for playing back contents by switching the contents in sequencein accordance with first and second play lists identifying the contentsthat are recorded, the playback method comprising the steps of:producing a display such that displays showing the contents in the firstand second play lists are arranged so that the contents are in sequencein a playback sequence from the content that is currently being playedback at least one of from a display of an operation element forinstructing the starting of playback and from a display of an operationelement for instructing the stopping of playback; and switching betweenthe arrangements of the displays of the first and second play listsshowing the contents in response to the switching of the playback of thecontents, wherein the display showing the content whose playback hasbeen terminated is placed at an end of the arrangement of the contentsforming the first or second play list from which it was played back. 11.The playback method according to claim 10, wherein the display showingthe content is a name of the content.
 12. The playback method accordingto claim 10, wherein the content is audio data.
 13. A playback methodfor playing back contents by switching the contents in sequence inaccordance with first and second play lists identifying the contentsthat are recorded, the playback method comprising the steps of: forminga display showing content that is currently played back in apredetermined area of a display section; producing a display such thatdisplays showing contents of the first and second play lists arearranged so that the first and second play lists contents becomecontinuous in sequence in a playback sequence with respect to thedisplay showing the content that is currently played back; and switchingbetween the arrangements of the displays of the first and second playlists showing the contents in response to the switching of the playbackof the contents, wherein a display showing content whose playback isterminated is placed at an end of said arrangement of the contentsforming the first or second play list from which it was played back. 14.The playback method according to claim 13, wherein the display showingthe content is a name of the content.
 15. A playback method for playingback contents in sequence in accordance with first and second play listsidentifying the contents that are recorded, the playback methodcomprising the steps of: displaying the first and second play lists;switching between displays of the first and second play lists andplaying back one piece of content of the second play list when aplayback of one piece of content of the first play list is terminated;displaying at least content that is currently played back and content tobe played back such that the currently played contents and thesubsequently played contents are mutually distinguished from othercontent, placing a display showing content whose playback is terminatedat an end of the corresponding arrangement of the contents forming thefirst or second play list from which it was played back.
 16. Theplayback method according to claim 15, further comprising the steps of:producing a display such that displays showing contents of the first andsecond play lists are arranged so that the contents become continuous insequence in a playback sequence from the content which is currentlyplayed back at least from one of a display of an operation element forinstructing a starting of playback and a display of an operation elementfor instructing a stopping of playback; and displaying at least thecontent that is currently played back and the content to be played backnext such that the currently played content and the subsequently playedcontent are mutually distinguished from other content.
 17. The playbackmethod according to claim 15, further comprising the steps of: forming adisplay showing the content that is currently played back in apredetermined area of a display section; producing a display such thatdisplays showing contents of the first and second play lists arearranged so that the contents become continuous in sequence in aplayback sequence with respect to the display showing the content thatis currently played back; and displaying at least the content that iscurrently played back and the content to be played back next such thatthe currently played content and the subsequently played content aremutually distinguished from other content.
 18. The playback methodaccording to claim 15, wherein the content is audio data and playbackresults of the continuous contents are mixed and output.
 19. A recordingmedium on which a playback processing procedure for playing backcontents by switching the contents in sequence in accordance with firstand second play lists identifying the contents that are recorded, theplayback procedure comprising the steps of: producing a display suchthat displays showing contents of the first and second play lists arearranged so that the contents are continuous in sequence in a playbacksequence from content that is currently played back at least from one ofa display of an operation element for instructing a starting of playbackand a display of an operation element for instructing a stopping ofplayback; and switching between the arrangements of the displays of thefirst and second play lists showing the contents in response to theswitching of the playback of the content, wherein the playbackprocessing procedure places a display showing content whose playback isterminated at an end of the arrangement of the contents of the first orsecond play list from which it was played back.
 20. A recording mediumon which a playback processing procedure for playing back contents insequence by switching the contents in accordance with first and secondplay lists identifying the contents that are recorded, the playbackprocessing procedure comprising the steps of: forming a display showingcontent that is currently played back in a predetermined area of adisplay section; producing a display such that displays showing contentsof the first and second play lists are arranged so that the first andsecond play lists contents become continuous in sequence in a playbacksequence with respect to the display showing the content that iscurrently played back; and switching between the arrangements of thedisplays of the first and second play lists in response to the switchingof the playback of the contents, wherein the playback processingprocedure places a display showing content whose playback is terminatedat an end of the arrangement of the contents forming the first or secondplay list from which it was played back.
 21. A recording medium on whicha playback processing procedure is recorded for playing back contents insequence in accordance with first and second play lists identifying thecontents that are recorded, the playback processing procedure comprisingthe steps of: displaying the first and second play lists; switchingbetween displays of the first and second play lists and playing back apiece of content of the second play list when a playback of a piece ofcontent of the first play list is terminated; displaying at leastcontent that is currently played back and content to be played back nextsuch that the currently played content and the subsequently playedcontent are mutually distinguished from other content; and placingcontent whose playback is terminated at an end of the correspondingarrangement.
 22. The recording medium according to claim 21, wherein theplayback processing procedure further comprises the step of: producing adisplay such that displays showing the contents of the first and secondplay lists are arranged so that the contents become in sequence in asequence in which playback is performed starting from the content thatis currently being played back at least from one of a display of anoperation element for instructing a starting of playback and a displayof an operation element for instructing a stopping of playback.
 23. Therecording medium according to claim 21, the processing procedure furthercomprising the steps of: forming a display showing the content that iscurrently played back in a predetermined area of a display section; andproducing a display such that displays showing the contents of the firstand second play lists are arranged so that the contents becomecontinuous in sequence in a playback sequence with respect to thedisplay showing the content that is currently played back.